机电专业外文翻译研究基于小波变换的直线电机驱动系统.docVIP

机电专业外文翻译---研究基于小波变换的直线电机驱动系统 附录A Research on Linear Motor Driving System Based on Wavelet Transform Abstract end-effect is a main reason of influence on the characteristic of linear motor driving system, its direct impact is nonstableand undulate edges magnetic field. the wavelet transform is applied to analyze the linear motor driving system performance in this paper. The improving thrust response system has been presented based on choice wavelet function and wavelet transform. Simulation results indicate that the proposed control strategy can abate the thrust ripple problem caused by end effect in linear motor control system, and make the system have good performances. Keywordswavelet transform; Linear motor; End effect； Direct thrust control system Introduction France physicist Morlet first applied the wavelet to analyzing the partial characteristic of earthquake wave in 1984. Because wavelet transform is a kind of analysis method for time-scale (frequency) signal, in time-domain and frequency-domain, which has the ability of exploring signal features with partial characteristic. Therefore, in the last years, the special analysis method has made itself theories rapid development and extensive application, especially in the aspects of signal analyzing and image processing areas. Linear motor has longitudinal edge and transverse edge, for this reason the linear motor exist special end-effect. Longitudinal end-effect is caused by finite length primary iron-core. Transverse end-effect is caused by finite width of primary and secondary, secondary current and secondary plates affecting the air-gap magnetic field. This is the main difference between the linear motor and the rotating machine. Longitudinal end-effect not only causes motor losses, lower electric efficiency and thrust, but also leads to motor work characteristic aggravation. Therefore, key factor is to analyze the longitudinal end effect in this paper. Traditional an